//
//  MainTabBar.swift
//  weibo
//
//  Created by apple on 15/12/12.
//  Copyright © 2015年 LYR. All rights reserved.
//

import UIKit

class MainTabBar: UITabBar {
    
//   UIView 默认的构造方法
//    重写父类的构造方法
    override init(frame: CGRect) {
        
        super.init(frame: frame)
        
        addSubview(componseBtn)
        
    }
    
    required init?(coder aDecoder: NSCoder) {
        
        super.init(coder: aDecoder)
        
        addSubview(componseBtn)
        
    }
    
    override func layoutSubviews() {
        
        super.layoutSubviews()
        
        let w = self.bounds.width / 5
        
        let h = self.bounds.height
        
        let rect = CGRect(x: 0, y: 0, width: w, height: h)
        
        var index: CGFloat = 0
        
        for subView in subviews {
            
            if subView.isKindOfClass(NSClassFromString("UITabBarButton")!) {
            
            subView.frame = CGRectOffset(rect, index * w, 0)
                
                index += (index == 1 ? 2 : 1)
            }
            
        }
        
        componseBtn.frame = CGRectOffset(rect, 2 * w, 0)
        
    }
    
//    加号懒加载
    lazy var componseBtn: UIButton = {
    
        let btn = UIButton()
        
        btn.setImage(UIImage(named: "tabbar_compose_icon_add"), forState: .Normal)
        
        btn.setImage(UIImage(named: "tabbar_compose_icon_add_highlighted"), forState: UIControlState.Highlighted)
        
        btn.setBackgroundImage(UIImage(named: "tabbar_compose_button"), forState: UIControlState.Normal)
        
        btn.setBackgroundImage(UIImage(named: "tabbar_compose_button_highlighted"), forState: UIControlState.Highlighted)
        
        btn.sizeToFit()
        
        return btn
    
    }()
    
}







